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Sprinkler-Head Bayonet Hide-A-Key Canister
A buried key safe disguised as a pop-up sprinkler head. The 36 mm OD × 80 mm canister has a 30 mm bore that takes a house key or two, plus drain holes in the floor. A black 44 mm sprinkler-style cap locks onto it with a two-lug bayonet and a 40° twist, and has a coin slot so you can open it with a coin.
Bayonet Twist-Lock Quick-Change Mount
A two-piece bayonet coupler that prints as one captive assembly: drop-in plug, twist 60° and three keys lock under the socket lip, past a detent bump and into a hard stop. Socket flange is 68 mm square with M4 clearance holes on a 56 mm square (14 mm tall); the 40 mm plug disc takes M4 on a 22 mm square, with a 20 mm centre pass-through for cable or a shaft — for swapping lights, sensor pods, cameras or tool heads off a fixed base.